console.log( 'fourth-module');

const name = '天字四号';
const version = '4.0';

const add = (a,b) => a+b;
const sub = (a,b) => a-b;
const mult = (a,b) => a*b;
const div = (a,b) => a/b;

// 按需导出(集中导出一批成员)
export {
    add,
    sub,
    mult,
    div
}

// 默认导出
// export let default = { }
export default {
    name,
    version
}